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Minimization of Parasitic Capacitance between Skin and Ag/AgCl Dry Electrodes.
Micromachines (Basel)
July 2024
Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.
Conventional dry electrodes often yield unstable results due to the presence of parasitic capacitance between the flat electrode surface and the non-uniform skin interface. To address this issue, a gel is typically placed between the electrodes to minimize parasitic capacitance. However, this approach has the drawbacks of being unsuitable for repeated use, limited lifetime due to gel evaporation, and the possibility of developing skin irritation.
View Article and Find Full Text PDFEffects of Body Positioning When Assessing Lymphedema of the Lower Limb Using Bioimpedance Spectroscopy.
Lymphat Res Biol
February 2024
Australian Lymphoedema Education, Research and Treatment Centre, Department of Health Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia.
Bioimpedance spectroscopy (BIS) measurements are conventionally performed in supine position with a lead device attached to gel-backed electrodes, and more recently, with a stand-on device that uses fixed stainless-steel electrodes under the hands and feet. The aim of this study was to assess and compare BIS measurements made in supine, sitting, and standing positions using lead and stand-on impedance devices in participants with and without unilateral leg lymphedema. Participants with self-ascribed unilateral leg lymphedema ( = 24) and healthy controls ( = 71) were recruited using a cross-sectional study design.
View Article and Find Full Text PDFAdd-on soft electronic interfaces for continuous cuffless blood pressure monitoring.
Adv Mater Technol
August 2023
Department of Biomedical Engineering, and Center for Remote Health Technologies and Systems, Texas A&M University, College Station, TX 77843, USA.
Continuous monitoring of arterial blood pressure is clinically important for the diagnosis and management of cardiovascular diseases. Soft electronic devices with skin-like properties show promise in a wide range of applications, including the human-machine interface, the Internet of things, and health monitoring. Here, we report the use of add-on soft electronic interfaces to address the connection challenges between soft electrodes and rigid data acquisition circuitry for bioimpedance monitoring of cardiac signals, including heart rate and cuffless blood pressure.
View Article and Find Full Text PDFValidating Adhesive-Free Bioimpedance of the Leg in Mid-Activity and Uncontrolled Settings.
IEEE Trans Biomed Eng
September 2023
Objective: Musculoskeletal health monitoring is limited in everyday settings where patient symptoms can substantially change - delaying treatment and worsening patient outcomes. Wearable technologies aim to quantify musculoskeletal health outside clinical settings but sensor constraints limit usability. Wearable localized multi-frequency bioimpedance assessment (MFBIA) shows promise for tracking musculoskeletal health but relies on gel electrodes, hindering extended at-home use.
View Article and Find Full Text PDFDevelopment of a Small Footprint Device for Measuring Electrodermal Activity in the Palm of the Hand.
J Electr Bioimpedance
January 2022
Department of Physics, University of Oslo, Oslo, Norway.
This paper describes the proof of concept for a wearable device that measures skin conductance, to provide a way of quantifying an individual's physiological stress response to external stimuli. Important goals of the project were to have reliable measurements that correlate with the external stimuli, as well as a small footprint and low power consumption to facilitate battery powered operation. These goals were accomplished using a STM32L476 micro-controller to generate an AC sine voltage across two solid gel electrodes placed in the palm of the hand, converting the resulting current to a voltage with a trans-impedance amplifier, which was then sampled and processed digitally in a lock-in amplifier, to eliminate signals differing from the desired (reference) frequency and phase.
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